The International Cessna^® 170 Association

I was wondering if anyone has any had any experience with Slick/Autolite spark plugs. Decided to replace plugs at annual and bought the Slicks as they were about $3.50 cheaper. The mechanic doing the annual commented that he didn't like the plugs as the electrodes bent too easily. On runup after installation found two bad plugs that had to be replaced. Spruce replaced them, but I obviously didn't save anything by the time I paid the shop for diagnosing the problem. Runup is OK now but haven't had a chance to fly do to work and weather

Stick with what works let somebody else do the testing. Lots of times cheaper is not. Sometimes it is.

I've used em with no problems. Work good.

Bill

Bill Rusk wrote:I've used em with no problems. Work good.

Bill

Me too. Also, they appear to be stainless, so they shouldn't have the tendency to rust like Champions can after several years.

Eric

I have used Autolite plugs for the last 40 flight hours and they are working fine.

Harry

My last set was Champions. I'd asked the guru's over at RAM aircraft engines which plugs they recommended, and they told me that they only use Champions because they'd had too many problems with Unison/Autolites. I'd wanted the Unison/Autolites because I'd hoped their nickel alloy would let me avoid the rusting problem with the bases.
Anyway, I installed Champions like they recommended. They work fine.
Six months later I was over at RAM with a client's aircraft, and I noticed all the new RAM engines were being sold with Unisons.

I installed Autolites last year and like them fine.

Harold
M# 893
N92CP

I've got over 200 hours on a set of Unisons with no problems. They still exhibit rust thru the nickel plating but not as bad as Champions rust thru their grey paint.

If you can't stand the rust, the next time you clean your plugs, just mask off both ends (including the threads), and squirt them with some high temp paint.

Miles

cessna170bdriver wrote:If you can't stand the rust, the next time you clean your plugs, just mask off both ends (including the threads), and squirt them with some high temp paint.

Miles

What's your approval basis?

gahorn wrote:

cessna170bdriver wrote:If you can't stand the rust, the next time you clean your plugs, just mask off both ends (including the threads), and squirt them with some high temp paint.

Miles

What's your approval basis?

George I see your back in your usual form after your days off.

If you can't stand the rust, the next time you clean your plugs, just mask off both ends (including the threads), and squirt them with some high temp paint.

Miles

I would just do it with a log book entry and new weight & balance, assuming that you are using certified aircraft quality paint of course.

I have the STC for repainting Champion spark plugs, all the approved paperwork can be purchased for $20. If you paint your plugs with just a logbook entry or even a field approval, you will be in BIG trouble! So just send me some money & you'll be OK.

Eric

PS: I'm serious!

George,

What's the statute of limitations on illegally painted spark plugs? Is the AI whose idea it was in danger of losing his certificate?

Eric,

Are there separate STC's for the Champions and Unisons, or are both included for one low price?!

Thanks for the comments. I have a feeling that the remark that " the electrodes bent too easily" was the point at which the two plugs were damaged. Since those of you that are using them have had no problems, I'm hoping it's a case of bad start good finish.

Keith